Home / Accessory-Stocks / SIG SAUER MPX STOCK ADAPTER ASSEMBLY You cannot add "Heckler and Koch (HK USA) FOLDING STOCK SP5K BLACK" to the cart because the product is out of stock. Sale! SIG SAUER MPX STOCK ADAPTER ASSEMBLY$12999 $12618 In stock SIG SAUER MPX STOCK ADAPTER ASSEMBLY quantity Add to cart SKU: ADAPTER-X-FOLD Category: Accessory-Stocks Product ID: 59100 Description Description Related products Sale! Heckler and Koch (HK USA) VP9SK/VP9SK-B OR SLIDE $40500 $35320 Wilson Combat SUPERSTOC CARB BUTTSTOCK BLK $5995 Sale! Heckler and Koch (HK USA) VP9 MATCH OR LONG SLIDE $54900 $47490 Sale! Heckler and Koch (HK USA) VP9 OR LONG SLIDE TALL SIGHTS $49900 $37683